//
// Copyright 2018 Pixar
//
// Licensed under the Apache License, Version 2.0 (the "Apache License")
// with the following modification; you may not use this file except in
// compliance with the Apache License and the following modification to it:
// Section 6. Trademarks. is deleted and replaced with:
//
// 6. Trademarks. This License does not grant permission to use the trade
//    names, trademarks, service marks, or product names of the Licensor
//    and its affiliates, except as required to comply with Section 4(c) of
//    the License and to reproduce the content of the NOTICE file.
//
// You may obtain a copy of the Apache License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the Apache License with the above modification is
// distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the Apache License for the specific
// language governing permissions and limitations under the Apache License.
//

#include "pxr/base/trace/collection.h"

#include "pxr/pxr.h"

#include <unordered_map>


PXR_NAMESPACE_OPEN_SCOPE

void TraceCollection::AddToCollection(const TraceThreadId& id, EventListPtr&& events)
{
    EventTable::iterator it = _eventsPerThread.find(id);
    if (it == _eventsPerThread.end()) {
        _eventsPerThread.emplace(id, std::move(events));
    } else {
        it->second->Append(std::move(*events));
    }
}

void
TraceCollection::Iterate(Visitor& visitor) const {
    using KeyTokenCache =
        std::unordered_map<TraceKey, TfToken, TraceKey::HashFunctor>;
    KeyTokenCache cache;
    visitor.OnBeginCollection();
    for (const EventTable::value_type& i : _eventsPerThread) {
        const TraceThreadId& threadIndex = i.first;
        const EventListPtr &events = i.second;
        visitor.OnBeginThread(threadIndex);
        for (const TraceEvent &e : *events) {
            if (visitor.AcceptsCategory(e.GetCategory())) {
                // Create the token from the hash using a cache because there 
                // are likely to be many duplicate keys.
                KeyTokenCache::const_iterator it = cache.find(e.GetKey());
                if (it == cache.end()) {
                    it = cache.insert(
                        std::make_pair(e.GetKey(),
                            TfToken(e.GetKey()._ptr->GetString()))).first;
                }
                visitor.OnEvent(threadIndex, it->second, e);
            }
        }
        visitor.OnEndThread(threadIndex);
    }
    visitor.OnEndCollection();
}

TraceCollection::Visitor::~Visitor() {}

PXR_NAMESPACE_CLOSE_SCOPE
